Typewriting machine



De@ 8, 1942- H. J. HART 2,304,498

TYPEWRITING MACHINE Filed lay 6, 1942 Patented Dec. 8, 1942 s PATENT OFFICE TYPEWBITING MACHINE Henry Joseph Hart,

West Hartford, Conn., as-

signor to Royal Typewriter Company, Inc., New

`York, N. Y., a corporation of New York Application May 6, 1942, Serial. No. 441,953

1 Claim.

This invention relates to typewriting machines and more particularly `to ribbon spools for such machines. Spools embodying the invention are adapted for use with typewriting machines vof various classes, such as conventional or cnice type typewriters or other machines in which an inked or carbon paper ribbon is moved past a printing point. Examples of other such machines are adding or computing machines, and cash registers.

Heretofore, insofarV as I am aware, ribbon spools customarily have been made entirely of metal, supplies of which often, and particularly at the present time, are limited. An object of the invention is to provide a ribbon spool of nated plastic iianges or discs and a metal plate for mounting a ribbon reversing device, the plate being cut and bent in a novel manner to provide a mounting for the ribbon reversing device.

Other objects will become apparent from a reading of the following description, the appended claim, and the accompanying drawing, in which:

Figure l is a top plan view of a ribbon spool embodying the invention;

Figure 2 is a section on the line 2-2 of Fig'- ure 1;'

Figure 3 is a section on the line 3-3 of Figure 1;

Figure 4 is a plan view of a modified or difierent form of ribbon spool embodying the invention; and

Figure 5 is a section on the line 5-5 of Figure 4.

Figures 1, 2, and 3 show the invention as being embodied in a ribbon spool particularly adapted for use in connection with the Royal discs C and D preferably are formed of lami-` nated plastic such as Textolite, a phenol laminated plastic, although plastic or fibre materials other than the specific product Textolite" may be used.

The core B is in the form of a hollow body I formed with prongs or ears 2 which extend through locating openings 3 formed respectively in the discs C and D, and the lever mounting plate E. Barbs 4 may be provided for securing the ribbon end to the core.

The hub A may be formed from sheet metal rolled into a tube and is arranged to extend through openings 5, 6 and 1 respectively in the discs C and D and the plate E, the protruding ends of the core being swedged outwardly at 8-8 over the plate E and a washer c on the disc C.

'I'he mounting plate E is cut inwardly from its periphery along a first chordal linel 9 and the metal included between the line 9, a second chordal line Ill perpendicular to the line 9 and the peripheral arc between the lines 9 and I0 is turned upwardly to form an ear I I. Metal cut standard typewriter, which is of well known construction. vIn this embodiment the spool` comthe hub G extend through openings 22 in the prises a hub A adapted to be fitted over a driving spindle (not shown), a. core B on which the ribbon is adapted to be wound, end plates or discs C and D and a ribbon reversing lever mounting plate E. The hub A, core B and plate E may all conveniently be formed of metal, but in accordance with' the invention. the end plates or and turned up to provide an opening I2 forms an ear I3 which cooperates with the ear II for mounting a shaft I4 on which is supported an' L-shaped lever I5 urged to the position shown in Figure 2 by a coil spring I6. The lever I5 is provided for cooperation with typewriter parts (not shown) for effecting reversal of the ribbon driving mechanism in a known manner as explained more fully, for example, in the patent to L. C. Myers 1,084,656 granted January 20, 1914.

The modified form of ribbon spool shown in Figures 4 and 5 is more particularly adapted for vuse with Royal portable typewriters. This spool comprises a hub F, a core G, discs H--H and holding plates I-I. The parts F, G, and I--I may conveniently-be formed of metal, but in accordance with the present invention, the discs H-H preferably are formed of a laminated plastic material such as Textolite or the similar materials referred to above.

The core G is provided with two oppositely disposed ears I8I8 which extend through openings I9 in the discs H and openings 20 in the plates I. Other oppositely disposed ears 2| on disc H and lie against the periphery of the plates I, the arrangement being such that the ears I8 and 2I hold the core G and discs H against movement transversely to the axis of the hub F.

The hub F may be formed o'f sheet metal rolled to form a tube which extends through holes 23 in the discsH and holes 24 in the plates I. The protruding ends of the hub are swedged outwardly as at separation axially of the hub. Holes 26 may be formed to extend through the plates I and discs H for receiving a driving pin or the like forming part of ribbon feeding mechanism (not shown).

'I'he discs C, D and H although suilciently stiff are Just springy enough and have just enough "glve or compressibility to cooperate with the metal holding parts to provide an assembly which does not work loose so as to rattle and become noisy after long use. Consequently the spools may be used over and over again without becoming unserviceable. The constructions shown for the purposes of illustration embody the invention in practical and preferred forms, but some changes 25 for holding the parts against may be made within the scope of the I claim: A typewriter or the like ribbon spool comprising a ribbon-winding core; non-metallic ilanges at the ends of the core respectively; a circular mounting plate on the outside face oi' one oi said ilanges, said plate having a cut extending inwardly from its periphery along a ilrst chordal line, a portion oi said plate being included between said ilrst chordal line, a second chordal line perpendicular to said rst chordal line, and the peripheral arc between said first and second chordal lines, said plate portion being bent upwardly about saidy second chordal line to form a ilrst ear; a second ear on said mounting plate; and a device mounted on said ilrst and second ears and adapted to cooperate with ribbon reversing mechanism on a typewriter or the like on which the spool is adapted to be mounted.

HENRY JOSEPH HART. 

